Molecular hydrogen in natural mayenite

Evgeny Galuskin, Irina Galuskina, Yevgeny Vapnik, Mikhail Murashko

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In the last 15 years, zeolite-like mayenite, Ca12 Al14 O33, has attracted significant attention in material science for its variety of potential applications and for its simple composition. Hydrogen plays a key role in processes of electride material synthesis from pristine mayenite: {Ca12 Al14 O32 }2+ (O2 ) → {Ca12 Al14 O32 }2+ (e )2 . A presence of molecular hydrogen in synthetic mayenite was not confirmed by the direct methods. Spectroscopy investigations of mayenite group mineral fluorkyuygenite, with empirical formula (Ca12.09 Na0.03 )12.12(Al13.67 Si0.12 Fe3+ 0.07Ti4+ 0.01)12.87O31.96 [F2.02 Cl0.02 (H2 O)3.22 (H2 S)0.150.59 ]6.00, show the presence of an unusual band at 4038 cm−1, registered for the first time and related to molecular hydrogen, apart from usual bands responding to vibrations of mayenite framework. The band at 4038 cm−1 corresponding to stretching vibrations of H2 is at lower frequencies in comparison with positions of analogous bands of gaseous H2 (4156 cm−1 ) and H2 adsorbed at active cation sites of zeolites (4050–4100 cm−1 ). This points out relatively strong linking of molecular hydrogen with the fluorkyuygenite framework. An appearance of H2 in the fluorkyuyginite with ideal formula Ca12 Al14 O32 [(H2 O)4 F2 ], which formed after fluormayenite, Ca12 Al14 O32 [□4 F2 ], is connected with its genesis. Fluorkyuygenite was detected in gehlenite fragments within brecciaed pyrometamorphic rock (Hatrurim Basin, Negev Desert, Israel), which contains reduced mineral assemblage of the Fe-P-C system (native iron, schreibersite, barringerite, murashkoite, and cohenite). The origin of phosphide-bearing associations is connected with the effect of highly reduced gases on earlier formed pyrometamorphic rocks.

Original languageEnglish
Article number560
Pages (from-to)1-11
Number of pages11
JournalMinerals
Volume10
Issue number6
DOIs
StatePublished - 1 Jun 2020

Keywords

  • Barringerite
  • Fluorkyuygenite
  • H
  • Hatrurim Complex
  • Israel
  • Mayenite
  • Molecular hydrogen
  • Negev Desert
  • Pyrometamorphic rocks
  • Raman spectroscopy
  • Shreibersite

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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